Detonating burglar-alarm.



J. M. BUTCHER.

MTNESSES luvs/via? u mzs N- BUTGHER Patented Sept. 19,1911. 1

UNITED STATES PATENT OFFICE.

JAMES M. BUTCHER, OF ST. LOUIS, MISSOURI, ASSIGNOR T EDWARD T. RAINEY, OF THOMPSONVILLE, ILLINOIS.

DE'IONATING BURGLAR-ALARM.

, To all whom it may concern:

Be it known that I, JAMES M. BUTCHER,

. a citizen of the United States, residing at St. Louis, M1ssour1, have invented a certain alarm of my improved construction in a set position and applied to the rear edge of a door. Fig. 2 is a perspective view of my improved burglar alarm, the same being in a set positionand applied to a window. Fig. 3 is a side elevation of the alarm. Fig. 4 is a front elevation of my improved alarm. Fig. 5 is a vertical section taken through the center of the barrel portion of the device, and showing the spring pressed plunger therein. Fig. 6 is an elevation of the trigger used in connection with my improved alarm.

My invention relates to that type of burglar alarm which utilizes a blank cartridge, which is exploded to give an alarm when the door or window to which the alarm is at tached is opened.

The principal object of my invention is to i provide a simple compact alarm which occupies little space, can be readily applied to doors and windows, and which is positive in action when the set trigger is released.

My invention consists in a suitable holder, a portion of which is yielding, a barrel in which operates a spring actuated plunger, a removable cartridge carrier, and an adjustable trigger for maintaining the plunger in a set position.

My invention further consists in certain novel features of construction hereinafter more fully described and claimed.

Referring by numerals to the accompanying drawings 1 designates a thin metal plate forming the main body of the holder of my improved alarm, and formed in the upper and lower left hand corners of this plate are apertures 2 adapted to receive tacks, screws or like devices for fastening the alarm in position. The right hand port-ion of this plate is formed into a yielding tongue 3 by the formation of a vertical slot 1 in said Specification of Letters Patent.

Application filed January 16, 1911.

Patented Sept. 19, 1911.

Serial No. 602,964.

plate 1, and this slot is extended laterally toward the left hand atthe upper end of the plate to form a lateral extension 3 on the upper end of the yielding tongue.

Formed integral with the upper portion of the yielding tongue 3 is a rearwardly extending ear 5 in the under side of which is formed a notch 6. Pivotally mounted on the lower portion of this ear is the trigger comprising a circular head 7 provided with a notch 8 in its edge, and also provided with a short arm or finger 9.

Formed integral with and projecting rearwardly from the lower right hand corner of the plate 1 is an ear 10 and formed integral with and projecting rearwardly from the upper right hand corner of said plate 1 is a ring 11.

12 designates a barrel preferably constructed of a piece of metallic tubing and the upper portion of said barrel is engaged by the ring 11, and the lower end of said barrel rests upon and is closed by the ear 10. The barrel is fixed to the ear 10 and ring 11 by means of solder or in any suitable manner. Screw seated in the upper end of the barrel 12 is a tubular cartridge holder 13 provided with a knurled flange 1 1 on its upper end, whereby said cartridge holder can be seated in or removed from the barrel. Arranged to slide freely through the barrel is a plunger 15 provided on its upper end with a lug 16. Depending from the plunger is a stem 17 and positioned thereon and interposed between said plunger and the ear 10 is a compression spring 18. Formed in the side of the barrel 12 adjacent the ear 5 is a longitudinally disposed slot 19 and passing through this slot and seated in the plunger 15 is a pin 20 used for drawing the plunger downward in the barrel against the resistance offered by the spring 18 when the arm is set.

The upper edge of the ear 5 is inclined or beveled in order that when the pin 20 is moved downward through the slot 19 the ear 5 and the tongue 3 will be sprung outward as shown by dotted lines in Fig. 3, thus permitting the pin to pass to the lower portion of the slot 19 and engage in the notch 6 in the under side of the ear 5.

To load my improved alarm the holder 13 is unscrewed from the upper end of the bar rel, and a cartridge is inserted in the lower end of said holder. The cartridge holder is now reseated in the upper end of the barrel, and if the arm is to be applied to a door the pin 20 is engaged and moved downward through the slot 19 past the ear 5 and the disk 7 is rotated by means of the finger 9 until the parts occupy the positions seen in Fig. 1.

When the pin 20 is pulled downward to move the plunger 15 into the lower portion of the barrel 12 the spring 18 is compressed, thereby storing power therein and when the parts are thus positioned they must be manually held to prevent the spring 1.8 from expanding and drawing the plunger 15 to the upper end of the barrel. \Vith the parts manually held in their set positions the plate 1 and the lateral extension 3 of the tongue 3 are inserted between the edge of the door and the door casing, as shown in Fig. 1, and when the alarm is so positioned the pressure of the finger upon. the pin 20 and trigger, can be released, for while the portion 3 of the tongue 3 is confined between the edge of the door and casing the tongue 3 can not spring rearward and, therefore, the ear 5 is held above the pin 20. The arm 19 is swung into the position shown in Fig. 1, and the pin 20 bear ing against the edge of the disk 7 is held out of engagement in the notch 6.

The alarm is supported on the edge of the door by means of tacks or like fasten ing devices inserted through the apertures 2. hen the door to which my improved alarm is attached is opened to such a degree as to permit the portion 3 of the tongue 3 to swing outward, due to the upward pressure of the pin 20 against the edge of the disk 7, the plunger 15 carrying said pin 20 will shoot upward through the barrel 12 and the lug 16 strikes against the head of the cartridge, thereby exploding the same, and thus giving an alarm. As the pin 20 passes the lower portion of the ear 5 the arm 9 will be swung upward in the direction indicated by the dotted lines j A in Fig. 1, the tongue 3 and portion 3 will be swung rearward as indicated by dotted lines in Fig. 3.

Where my improved alarm is applied to a window the plate 1 is arranged on the side rail of the upper sash as shown in Fig. 2 and attached thereto by means of tacks orin any suitable manner and the pin 20 is moved downward below the ear 5 and engaged in the notch 6 in said ear. disk 7 is rotated to bring the notch 8 into a position where it will coincide with the notch 6 and with the parts so set the arm 9 projects outward at right angles to the vertical plane occupied by the body of the i The alarm.

When the upper sash is lowered and the lower sash is raised the arm 9 will be swung upward, thereby rotating the disk 7 to unseat the pin 20 from the coinciding notches 6 and 8 and the pressure stored in the coil spring 18 is now exerted to move the plunger upward and discharge the cartridge.

A detonating burglar alarm of my improved construction is comparatively simple, can be very cheaply produced, occupies little space and can be readily applied to doors, windows and desk drawers.

It will be readily understood that minor changes in the form of construction of the various parts of my improved alarm can be made and substituted for those herein shown and described without departing from the spirit of my invention.

I claim:

1. In a detonating burglar alarm, a plate, a spring tongue carried thereby, a barrel carried by the plate, a cartridge holder detachably arranged in one end of the barrel, a spring driven plunger arranged for operation within the barrel, a finger carried by and projecting through a slot in the barrel, an ear formed on the spring tongue, in the under side of which ear is formed a notch in which the finger is adapted to engage for holding the plunger in a set position, a disk pivotally mounted on the ear, which disk is provided in its edge with a notch adapted tocoincide with 'the notch in the ear and engage the finger when the same is seated in the notch of the Eear and an arm on said disk whlch arm 1s adapted to be engaged when the disk is rotated.

2. In a detonating burglar alarm, a plate,

a spring tongue carried thereby, a barrel carried by the plate, a cartridge holder detachably arranged in one end of the barrel, 1 a spring driven plunger arranged for opera- 1 tion within the barrel, a finger carried by j and projecting through a slot in the barrel,

an ear formed on the spring tongue in the 1 under side of which ear is formed a notch in which the finger is adapted to engage for holding the plunger in a set position, a disk pivotally mounted on the ear, which disk is provided in its edge with a notch adapted to coincide with the notch in the ear, and means on said disk whereby the same may be engaged and rotated.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses, this 7th day of January, 1911.

ALMA GEBHART, M. P. SMITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

